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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
i got that.
thanks for the tips :D
This is a mostly correct solution. If pin is null, then this implementation will throw ArgumentNullException, which violates the specification that the function return false for any input other that 4 or 6 digits.